Beater belt fob hog scrapers



K. E. KERSTEN. BEATER BELT FOR HOG SCRAPERS.

APPLICATION FILED JAN. 23. I922.

Reissued Mar. 28,1922,

INVENTOR. Maw

A TTORNEY' K. E. KERSTEN'. BEAT ER BELT FOR HOG SCRAPERS. APPLiCATlON FILED JAN. 23, I922.

2 shins-sun 2.

INVENTOR.

Malt. BY WWW A TTORNEY Kenn E. xnnsrrniv, or on cne nmno s.

BEA-Ten BELT roe nos soanrnns.

To. allv whom z't-may cmwern:

=Be .itdmown that I,'I{ARL E. KnnsrnN,

sir-citizen of .the United States, residing at I Chicago, in the countyof Cook and State of 11llinois, haye invented a certain new and.

...be ,a full, clear, and exact description of the saine, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accom ...pai1ying drawings, which form a part of I .this specification.

, ..-revplving .shaft havingradially projecting; arms to which are attached beater belts 'carf zareiusually made of canvas and rubber; the 5 1A1 device-that is widely used for removing hair from hog carcasses consists of a rapidly rying scraping knives or blades. The belts canvas being in several layers. ,In order .Ithatith e knives or blades may do their work eproperly it is necessary that the supporting .belts bemade quite stiff so as not to yield .tooheasilyunder the impact of the blows which. they deliver when in use. On account of their stiffnessthe rapidly moving belts act very much like rigid members hinged at 'atheir inner ends, .thus producing compara- .tively sharp bends in the. belts immediately attached. The effect of these sharpbends is to subject some of the layers of the belts" .-atthe. ends of the arms to which they are .to 'heavy stresses which" soon bring about -:the destruction of such layer and thus end 35.

: the usefulness ofthe belts.

The object of the present invention is to producea simple and novel belt construc- 'lI-tion which will obviate injury to a beater belt in: the manner just explained and thus greatly increase the life of the beater belt.

:The various features of novelty whereby .,my invention is characterized will herein- ;aftenbe pointed out in the claims; but, for

, a full understanding of my invention and of its object and advantages, reference may be had to the following detailed description taken in connection with theaccompanying :fdrawings, wherein:

a Figure 1 is a=plan view of a supporting spider or beater belt, one of my improved 'belts being shown in place, and the supporting shaft being shown in section;

2 i s a plan yiew on a larger scale of the'outerend of'o'ne of the arms of the Specification of Rcissued Lettersl'atcnt. Reissuea Man 28 1922 Original. No. 1,329,529, dated February 3, 1820, Serial No. reissue filed January 23, 1922.

316,066, filed August 8, 1919. Application for Serial No. 531,278.

spider and the inner end of the beater belt carried thereby;

Fig. 3 is a view similar to Fig. 2, showing the belt bent back 'as its free end is being dragged. along a: carcass; I

.Fig; ll. is a', longitudinal section through the belt in the vicinity of the outer end of the supporting arm;

Fig. 5 is a section taken approximately on line 55 of Fig. 4; and

Fig. 6 is an edge view of that part of the belt shown in Fig. 4;, but'on a larger scale, illustrating a modification.

Referring to the drawings, 1 represents a spider or framehaving arms, 2, projecting radially therefrom. aThespider is adapted to be rigidly clamped on'a rotary shaft 3.

.is gradually deflected away from the belt to produce a rounded shoulder, 6, or seat, over which the belt may'bend when required to yield upon striking the carcass which is being operated upon.

All the partsheretofore described, except for the particular features'to which attention will hereinafter be directed, constitute a well known device or apparatus which has been selected simply to illustrate the principle of my invention and not for the purpose of limiting the invention to the details thereof.

l/Vhen in use the device is rotated in the counter clockwise direction as viewed in Fig. 1, the free end of the belt, carrying the knives or blades, 7, striking the carcass which is being operated upon and being defiected so as to make a sliding stroke along the carcass. On account of the stiffness of the belt thedeflection will be produced, in the main, by the creation of a comparatively sharp bend over the'shoulder, 6, and it is at this point where the belt wears out quickly, because of the enormous stretching stresses to which the fabric is subjected.

In accordance with my invention I so construct belts of this kind that provision is made at the points where they must bend sides that are placed under tension. This is accomplished, as best seen in Figs. 4 and 5, by placing between one or more back layers of fabric, 8, and a pile, 9, of front layers of fabric a layer, 10, of cushioning material, preferably rubber, so constructed that it will be quite yieldable in that zone, 11, in which the sharpest bend in the belt occurs when the'belt is in use. Therefore when the'belt is bent, as illustrated in Fig. 3, there is sufficient compression of the cushion at the bend to permit the front layers readily to adjust themselves to the convexity of the front face of the belt without being strained. If the cushioning layer is thickened in the zone, 11, so as to produce a forward bulge, this will cause the pile of front layers to curve outwardly and make the length of the front layers greater than that of theback layer or layers; this excess length being all placed where the demand for increased length comes when the belt is sharply bent as heretofore explained. l/Vith this arrangement,

when thebelt is called upon to bend in actual-practice, the cushioning material permi'rs'the lump or bulge to flatten out and thus permit the excess material in the front layers to compensate for the increased overall length of the belt on the convex side due to the bend. Consequentlythe stresses tending to .disrupt the front layers of the ordinary belt and tear the layers apart are either largely avoided or practically disst pated in the, cushion. The bulge gives-the added advantage of permitting the cushioning layer .to be made comparatively thin throughout the remainder of the belt.

made more yieldable in the zone 11 than at other points, so. as to make it. certain that there will be the requisite amount of compression of the cushioning layer in this zone to give the desired results. To this end chambers or hollows may be formed in the cushioning layer in the zone 11. This may conveniently be accomplished, for example, by extending a series of holes, 12, transversely through the cushion or, as shown in Fig. 6, by cutting elongated slots, 14:, through this part of the cushion, or by a combination of slots and holes. The holes or the holes and slots will close more or less during the bending of the belt, thus securing the desired compression of the cushion long before there is any danger of subjecting the elements of the belt to injurious stresses.

While I have illustrated and described in detail a single preferred form of my invention with slight modifications, I do not de sire to be limited to the particular details so illustrated and described; but intend to cover all forms and arrangements which come within the terms of the definitions of my invention constituting the appended claims.

direction and of an extent to produce a forward bulge extending entirely across the belt on the front side thereof. a v

3. A beatersbelt comprising front and back layers and an intervening cushioning layer, said cushioning layer havingair chambers will occur in use, the thickening being in a therein in the zone where a sharp 'bendin the belt will occur in use. w

a. A beater belt comprising front and back fabric layers and an intervening layer-of rubber, said layer of rubber .having a charm bered forward bulge causing a forward} bulge in the front fabric layers at a .point where a sharp bend occurs in the belt; during use.

5. A beater. belt containing a-layerbf flexible non-extensible material: and a cush-=;,

dially and thus reduce the stresses. in.:the'.

backwards at said point. 6. A beater belt'containing anon-extensible front layer and a cushioning layer'befirst mentioned layer when-the belt is. bent hind the same, said cushioning layerqbeing q thickenedat a point where a sharp bend in the belt will occur in use, the thickening being in a direction and of an extent to produce a forward .bulge in the front layer extending entirely across the. belt on ,the

front side thereof when the belt is in its normal flat condition.

7. A beater belt containing a front layer of fabric and a cushioning layer of-rubber behind the same, said layer of rubber being thickened at a point where a sharp bend in the belt will occur in use, thethickening being in a direction and of an extent to produce a forward bulge extending entirely across the belt on the front side thereof.

8. A beater belt containing a front layer of flexible non-extensible material and a cushioning layer behind the same, saidcushioning layer having air chambers therein in the zone where a sharp bend in the belt will occur in use.

In testimony whereof I sign this specification.

KARL E. KERSTEN. 

